Jigger for separating coal and slate.



H. J. MOYER. JIGGER ron SEPARA'HNG COAL AND SLATf.

APPLICATION FILED JULY H. 1915 Patented May 8, 1917.

3 SNEETS-SHEET I.

H. 1. MOYER. THIGH? FDR SEPARATING COAL AND SLATE. APPLICATIUN FILED JULY I4. 1915.

. 1,225,157. Patented May 8,1917.

{SHEETS-SHEET 2.

H. J. MOYER.

JIGGER FOR SEPARATING COAL AND SLATE.

APPLICATION men JULY H. IBIS- Patented May 8, 1917.

3 SHEETS-SHEET 3- '1"IIIlIIdIt/IIII'IIIIIIII IIIIIJIIIIIIJ lllllllill llllllll HARRY J. Mount, on PHILADELPHIA, rmms-vnvmm.

JIGGEB FbB BEPABATING COAL AND SLATE.

Specification of Letters Patent.

Patented-May 8, 1917.

Application filed- Iu1y'14, 1915. Serial No. 89,916.

- 770 allwhoniit may concern: I

1B itlznown that I, HARRY J. Movnn, a eitizen ofthe United States, residing M11516 'Wingohockingstreet, Philadelphia, in the .county of Philadelphia and State of Penn sylvania, have invented a certain new and useful Jigger for Separating Coal andSlate,

of whieh t 1e following is a specification.

"The "purpose of'my invention is to provide a Jigger tank havin a water-pulsating plunger-therein with a ox bottom section movable upwardly anddownwardly in response to varying weights of content, with or without corresponding movement of the 16 box or the remainder of the bottom, and to dam movement of the bottom upwardly to prevent the plunger from forcing the botto mor box upwardly with the content, in-

terfering with the separation, and to damp thom'ovement of the ottom downwardly to support the box content. YA'imither purpose of my invention is to damp themovome'nt of an upwardly and downwordlymovable jigger box bottom or box sub'ect'ed to pgunger action without objeoti'one; le lost mo ion in the damping. conne'otions. v

A'further purpose of my invention is ,to' provide 'bodily vertical movement fora jigggr bottom, with or without the rest of the x,subjeet to plu r. water actiom'a-uto msticoll ,adjust the eight'of the bottom or I box by e proportion of slate to coal therein and determining the slate .feed from the box by the height of. thebox. urther purposeof my inventiollis to the quantity of slate in the boi While maintainin a slant tor' the screen bottom of the boxw ioh shall advantageously teed the slate toward the outlet, varying the slant/flat,

difi'orent heights, where desi ,to improve the control over the movement of the slate.

Further. purposes of'my invention are to maintain substantially the sameslope of the screen bottom of a jigger box while the'bottom with or without the box is automatically moved. in o verticaldireetion corresponding in position to the proportion-of slate to Cool, in the box; to counterbalance the weight of a jigg'erbox or box bottom by weighted 1evers whose effective, fulcrum distances change to balance the box in diiferent positions, occordin to the weight of the-eontent; to p o i ,e means tor maintaining form of my invention.

ers and showing some. additional -form of box-sup ort'injg lever. Fig. 5 is a bro en view, portly in sect ion;

movable jigger box in raised position when first operated, as aftercleaninlfg'in oriierjto provide it with an initial bed tion by several forms thereof whioh are practical, eflicient and inex ensive "end which at the some time well illustratte the principles of my invention.

Figure l is a bi ken vertical through a jigger embodying the referred F 2 is n-transverse" seetion oi ture showzrin Fig. 1,-omitt-ing the ii y- Fig. 3 is a detailed section or the outlet.

door and counterweight. Fig. 4, is a. broken elevation of a. moified showing a seeo i modification or the box s port.

1g; 6'is a broken v use-(1f s ports -for diiterent parts 0 my [.Fi s is afbroken re t some of the ,'-Q 1 its the s'tru we seen. inFig. voters.

*Fig. 9 s t senants section neon l [a l'es to Fig.7,

n the drawi and the well-known {exaggerated elevation showin the Fig; 7 is abrolien verticelsotion .11 modificetion.

V r; box adapted to tilt the box h s rises o oi-ate ,avertically movable jigger box at. falls.'

heights intrersel'y proportional to similar numerals of ref 'erenoeindice'teliepe'rts. I i i inweight between coal and lute inherits mersed inwater causes the coal to work to the top and the slate to'rema-in on the bot-'- tom when the mass is agitated by waterboing forced upward through the perforated bottom of the jigger' boz; y plunger action,

While there has been no difliculty in obtaining a continuous and nearly uniformfeed of coal over the top edge of the jigger box which can be economicall handled by a conveIyer,'the withdrawal 0 the slate has been irregular and unsatisfactory.

In the best collieries or preparation plants it has been the practice for the operator to watch the jigger and tap the slate at intervals. errors of udgment, the slate has been allowed to accumulate until some of it passes over with the coal, injuring:its quality and risking its condemnation. Bejlgging 1nvolves the labor of the second handlin and breaks some of the coal, reducing its va ue.

-- At other times the slate is tapped for too longaiime until coal is wasted by passing out with the slate. Even when the slate is properly withdrawn by this method the intermittent character of the feed of slate prevents economical conveyer handling and does-not allow the jigger to be worked at its maximum ca acity.

Various e orts have been made to improve this condition by attempting automatic continuous withdrawal of the slate. Most of these efforts have proposed counter-weighted v weighting. This has been unsuccessful for various reasons, one of which is the absence of a counterpoise which varies as the weight on the door or gate changes its position. Another is the absence of a damper or stabilizer to prevent jiggling of the door by the agitated coal and slate.

'- Another system has proposed to hinge the jigger box along one edge and allow the increasing "weight of the content due'to increasing proportion of slate to swingthe grate bottom downwardly until the slate can be discharged. This is open to serious objection due to the cut-off character of outlet closure used and to the fact that the slope Of the grate bottom, if proper for discharge, iss'o much reduced with a lower slate bed as -to lose the desirable feeding of the slate toward the outlet. The absence of a damper or-stabilizer to prevent jiggling of the jig box bottom as well as the coaland slate is a serious defect here also. So'far as I am .aivare, no stabilizer capable of preventing the jiggling of a movable jig box or box bottom or section of the box or bottom has ever been usedin a jigger.

' rapid movement in either direction.

My invention is directed primarily to utilization of parttof or the: entire weight of the-box, content as the basis for control ofthe outlet, and stabilizing the box against ply'it'w'ith atype of slate gate which elimi- CJ the dan er of the slate sticking in the ing. -M y invention is made effective Fre uently, through his inattention or I tip-- moving the box or part of the bottom of t-hdbox bodily by means of the weight of the content or of counter-balancing weights to a height corres )onding with the weight of the content and dan'iping' the box or part whether the box be rigidly attached thereto or movably connected therewith and whether it be the entire bottom or only a section thereof; and the stabilizing of this counterbalanced box bottom screcn' against I sudden movement in either direction. In a. copending application, Serial No. 46,607, filed August 21, 1915, for .-m ovable bottom Screen jiggcr, I claim the species having the structure applied to a bottom screen which screen is movable with respect to the box.

Describing my preferred form in detail The tank 1 contains the water in which the jigger box is to be immersed. This reaches some such level as 2, above the reciprocable plunger 3. ,.\s is usual, this plunger operates at om side of the jigger box or in the rear thereof, in a space provided bya baflie or wall 4, so that the effect of the plunger action shall. be directed upon the perforated bottom of the coaland slate-receiving box .6, rather than upon the sides of the box. At the front of the tank I provide casings or boots 7 and- 8 in proximity to the outlets for coal and slate respectively, within which 100 casings any suitable conveyers 9 and 10 are located for the purpose of continuously carrying away the coal 11 and slate 12'. The combined coal and slate is delivered to the box through a chute from any suitable 05' pocket, such as ply source.

Asis generally the case with jiggers in which the water agitation is provided by a 13,.or other storage or supplunger, the mixed coal and slate is delivered to the jigger bo'x back of a baflle, such as 14, which is spaced from the bottom of the box by a distance which is adjustable through the sliding'closure 15, rod 16 and "sjlo; e of the pELforated bottom of the box an passes out through a front opening at 19. The slate'is protected close to the opening against crowding from the material directly above it by means of a. baflle 20.

' I prefer to pivot the door 21 above the opening and have it close toward the outwardl moving slate in order to avoid choking 0 the slate between the door and frame.

The counter-we ghtedar n 22' tends to open this dopr permittin iiseha-rge of the rod or counter-poise.

' 1 are eing constructed.

' rods 26ers secured.

slate whenever the position of the box is low enough. The lifting of the box causes automatic closing of the door by en agement of any part of the door, such as ange *2 3,"with a relatively fixed member 24, which I may be a part of the surrounding frame.

In this form I provide movement of the entire box, rather than of the bottom or a portion of the bottom only, the first named bein the preferred form where new jiggers The box is guided so as to permit vertical movement of the box and contents, including the battle 14 by any suitable means of which I have shown one form, best seen in Fig. 2. In this form the box is provided with brackets 25 to which Where slight tilting of the box during its movement is desired, a's'with the construction. seen in Fig. 6, the connection may be made by pins 2?, allowing slight'front and back movement of the upper parts of the rods due to the effect of this construction (Fig. 6') in raising and lowering one part more rapidly than the other. fBrackets 28 within the tank form stopslimiting the downward movement of the box.

Brackcts 29upon the box engage brackets 30 within the tank to check upward move ment. of, the box .'Where the tank. is to move at the same rate at all points, brackets are secured to the rods andbrackets 30 perform a guid ing function also.

At the upper ends of the rods'26, they are connected by a top 31, inorder to convenientlyutilize a single damping orstabilizing mechanism for regulating the upward movement of all of the rods instead of requiring separate stabilizing means for each The top is connected. with the rodsby a hinge connection comprising cars 32 and connected by a pin 34, and this same pin 1s conveniently engaged by the slotted or fork edend" 35 of a lever 36 for each rod 26. The levers are shown as having fixed 'fulcrum points 37 in my preferred form and as provided with counterwelghts, preferably two to each lever, illustrated at 38 and 39,

which ma. be adjusted for any run of coal and slate eing handled and are secured in position by set screws 40, 41.' D

It will be evident that the effective distances between the counter-weights and the fulcrum points varies with the angular positions of the levers, according to the harmonic law, while the effective distances from the fulcrums to the pins 34. is substantially the same in all positions of the levers.

I refer to use arcs of movement of the levers 36 so that the levers shall be horizontal or a little below the horizontal in the lowermost intended position of the box. Within this range, differing weights of the portion between the lengt toward the top.

box and contents, due to varying ercentagfis otherwise might occur to disturb the de sirable uniformity of increase of depth of slate toward the front.

In order that the pulsations ofthe plunger 3 may be confined, effectively to h PBrforated bottom of the box and the interior of the. box, it is desirable to reduce water leakagearound the sides of the box, as much as possible, without interfering with free upward and downward, preferably strictly vertical movement of the box. This has been done by flanges 42 at the sides of the box, flange 43 at the front and flange Mat the rear. The flanges 42 are connected at the back with vertical flanges 45 substantially in line with the rear wall of the box closing off the space at the side of the box from. free water entry at the rear.

he flanges42, -14 and 45 lie close enough to the walls of the tank to prevent appreciable fluctuation of water between them and the .flange 43 codperates with a tank flange 46 for the same purpose. At the lowermost position. of the jigger box passage of water between the flange 42 and the tank walls is additionally protected by flanges 47 against which the flanges 42 engage.

. Each stroke of the plunger gives an impulse to the box and its contents of coal and slate. If the box be balanced and free to move it will respond to the pulsations caused by the plunger, reducingor destroyin effect of these pulsations upon the coal and slate to lift and scatter them so that they will separate according to their subsiding Values with the slate on'the bottom, .My damper or stabilizer is intended to take the thrust of these successive water impulses caused by the plunger, holding the box so that the full. impulse will be effective for separation of the contents, without interfering with the slower movements of the box to reach point of equilibrium for each changing weight and equally effective in its stabilizing function in all positions of the box.

As will be pointed out later, the princi 1e is equally effective in stabilizing a mova 1e bottom or section of a box bottom, or other box part and constitutes .a very important no I the i part of my invention as applied to a bodily sure of the box content and desirably held in partially moved position to 'permit continuous, asdistinguished from intermittent feed of slate.

\Vhile obviously the meansof effectively damping vertical movement of the jigger box to prevent it from being jiggled by reason of the plunger impulsesmay be greatly varied in view of my disclosure to stabilize by other means or apply it in a single stabilizer or in distributed stabilizers to other parts of the movable mechanism, just as various other guiding and supporting means would be eifective,l have illustrated a dash pot stabilizer filled with oil or other suitable liquid for this purpose, as representing the most effective form and have applied it to the entire box through the rods as the most convenient mode of application.

The stabilizer is operatively connected with the table 31 by means of rod 48 and pin 49 upon'whieh it may be free both to rock and to move (if desirable to have the front and back of the box rise and fall at different rates) without introducing lost motion.

The stabilizer comprises a cylinder 50, filled with oil,vor other suitable liquid, and piston 51 with which the rod is connected. The cylinder is mounted upon any frame 52,

here shown as connected with the walls of the tank and leakage of oil from the bottom of the cylinder is prevented by gland 53.

I prefer to allow leakage of oil through the piston, as .by opening 54, rather than around it, in the operation of the dash pot and protect against lost motion due to air in the oil by putting the oil under pressure. I have shown one means of doing this by means of a pipe 55 which may be filled to any desired height to produce the required pressure, I have also shown an outlet pipe 56. The pipes are controlled by valves 57. The damper or stabilizer cylinder can be made larg enou b so that the movement if the piston will e as slow as desired owing to the small amount of oil or other liquid which will pass around the piston and through the opening 53.

Upon any suitable support, such as bracket 58. I pivot a lever 59 connected through yoke 60, slot 61 and pin 62, with the rod 48, so that pressure at the opposite end of the lever 59 will tend to lift the box 6 and lifting of the lever will tend to lower the box.

Because of the presence of pieces of metal in the mixed coal and slate, as delivered, which metal lies in the bottom of the box and does not feed out freely with the slate, as well as for other reasons, it is desirable to clean out the box from time to time. This may be accomplished by lifting the end (33 of the'le'ver 59 and holding it up by placing the pin 64 through theopening 65 and under the lever, resulting in a continued flow of content out through the opening 19 until the box is emptied sufiiciently to clean out the bottom grating at least. Inlet of coal and slate is preferably stopped during this time. At the start, the lever end 63 can be lifted very easily, but as the box empties, the unbalanced cou'nterpoise weight would become excessive and the pin 64 is supplied to take this pressure.

When the box is again supplied with mixed coal and slate, it will lack the slate bed initially and it is desirable to form this bed quickly; This maybe readily accomplished by the operator standing upon the end of the lever 59, as at 66, holding the box up to its'uppermost position for a timeto prevent flow through the bottom opening until the slate has had a chance to accumulate on the bottom in sufficient quantity to operate automatically.

In order to show that the oounterpoise means, even if of lever form, as preferred by me, can be varied in different ways from that shown in my preferred form while still obtaining the difference in proportion of lever arms by which balancing of the box at different heights for different weights is so conveniently obtained, I have illustrated other forms in Figs. 4 and 5.

Fig. 4 shows a reversal of that shown in Fig. 2, in that the end of the lever 36 is pivoted about the .pin 34 while the fulcrum point is made adjustable by slotting the lever, as at 67, where the pin 37 passes through it.

In the form shown in Fig. 5, the lever 36' is pivoted at its end in the pin 34 and the fulcrum point is fixed relatively to the length of the lever.

The pin 68 at the fulcrum point is connected with the pin corres )ondi'ng in position to pin 37, by means 0 a link 69. .The variation in effective leverages is obtained by-making the weight 39 freely movable along the length of the lever 36 under the control of a cam slot guide 70, in a bracket 71. A pin or pins upon the weight travel in this slot to move the weight along the lever according to any predetermined law, as the lever rises and lowers.

In Fig. 6 .fshow two constructions corresponding generally to the counter-poise levers of Fig. 2, but differing in that the lever 36 at the left is pivoted. as at 34, closer to the pin 37, than is the case with the lever 36". If one of these types of le er be used for the set supporting the front of the vertically movable box and the other for.the set supporting the rear thereof, it'will be evident that either the front or rear preferred will rise and lower more rapidly than the other part of the box, slightly canting the box durin its movement vertically. If the front be moved the more rapidly, for

example qa greater slope may be given the bottomof the box in its lowermost position for the purpose of more rapidly feeding out the slate when the percentage of slate is 5 running high and the lowermost position of the'box has been reached than when the percentage of slate is running low or when the box is not feeding slate at all, but accumuy lating a slate bottom This results without 1 interfering with a considerable ral'ige of box 1 movement during which the slope of the bottomof. the box maintained,though it be not uniform.

I-n some'uses of my invention it will not 5 be desirable to make the entire jigger box movable; This is particularly true of re constructlon of existing pggers where the ownersdo notcaro to make as much chai'ige as would beret uired for this. In suchcases a part of the enefit of my invention. may be obtained by making the bottom of the jigger ora part of the bottom of the jigger movable in the box and I have illustrated one form of the latter construction in Figs. 251,7, 8 and 9. Frommy two disclosures, ap-

plication of my stabilizer, variable weight counterpoise, movable; bottom, with or witl'r out movement of the box, etc, generallyto 1 4o itis movable, I prefer to have it lift and lower bodil rather than merely swing, for example. a transverse' fiange 74 upon the adjoining edge of the fixed portion of the bottom and I 45. by'th e inner face of the tank at the front,

as at 75: r

The flange 7 6 secured to the underside of the movable section of the bottom at the front, edge assists in the guiding function so andgprevents accidental intrusion olislate- Within the slate outlet opening 19 in the tankybeneath the movable section. illustration the movable section is connected with the stabilizer piston rod 48 by a pluno rality of rods 77 and a frame 7 8 connecting theme The rods are shown asthree innunr 'ber two located near the edges and the third thron h the longitudinal stiffening 'str 12C] T iese' alfo'rdfull support for qaogthe: weightiupon the movablesection and --to:br'ace it against tilting, It kept from moving'toward the front and rear by thev flanges and endwise by the walls of the tank.

'} Ishowfihe same general form of variable t .isguided in this movement by In the counterpoise or the weight of the bottom section as for the weight of the box in my other fornnfbut connect the levers 36 with the two end rods 77 within the freer spaces at the sides of the box, showing them'as ex 76 tending in planes at right angles to the planes or the lovers in the other form. I requirebut two levers and support the outboard end of the. pin 34! from the frame by a bracketr The 'pin 37 is supportediin a boss 79 upon the bracket 80;

The door is controlled ')ositiv ely in both I directions of moven'ient by rods 81which are attached. at one end to the lever 36 and at the other end to an arm 82 upont'he 3 extended door pivots 83. The frame52 is cut away at 84 to permit adjustmentof the height of the closure 15. I I

The lever 59 of my preferred formfimay be applied or oinittedas desired Where a 35' section of the bottom only is movable-the weight upon it is so much less than that of the entire box and contents that itis not so necessary. The position of the section may easily be within the range of control 9 of the operator by lifting or lowering the levers. 36.

I prefer to lift the openingrin the tank at its upper edge slightly above the uppermost position of the movable. bottom-,1 in 5' order that the range of movementpf the bottom. need notbe great in order to ro vide sufllcient outlet for the slate his does-not allow leakage of the slate; even where the bed of slate may be thinand-the bottom in its uppermost position, because of the door and is particularlydesirable where a section only of the entire: bottom :is to be moved. It avoidsthecutmfli obje'cr" tion to the closure. 1 i

In operation, the mixed coal-and slate are fed to the jigger box and thebomorseotion israiscd (either by lever 59hr by the" 1 levers 36) until the slate has settled to the bottom definitely enough to form a bed:

The box or bottom is then allowed to reach its own level inwproportionrto the weight and. operative jigging is begun. Theln-pward movement. of thewbox in my preferred form will be too gradual to be in 5 terfered with by thefeed of coal and slate into the box, and I have not throttled this feed byanyadjustable' gate for this reason. The movement of the coal from thechute into thebox. will be suflicient to permit the I box to rise without backing up any coal into the chute;

When'fthe'slate accumulates in the bottom. sufiiciently to move the boxor'bottom downwardly and open the' slateoutlet this movement takes place graduallyfboth because of thewcounterpoise used and, more especially, because of the stabilizer. With-Y i out the stabilizer a sudden feed" of slate i when the outlet is opened Wouldres ult in 134 the corresponding rise of the box or section shutting off the feed until there was another accumulation; and this has proved to be one of the causes of failure in what might be called the counter-weighted-trap-door type of jiggers to which reference has previously been made. Their failure has been the more complete because their counterweights have not balanced at different heights for different weights and the trap has moved the full distance open. when the required accumulation has been reached, resulting in a relatively sudden feed of slate. reducing the weight to below that of the counterweight and resulting in a. sudden closure. The spasmodic movements of slate have also tended to disturb the distribution of slate and coal, allowing coal to pour down toward the point of discharge to take the place of the slate discharged instead of having the slate steadily progress from the rear to the front, maintaining a substantiallyuniform upper sin-face as high as is expedient in the jigger. The coal which tends to crowd down toward the point of discharge interferes with the norn'ial progress of the slate toward the front and must be displaced before the slate can fill this space up to again exert the required pressure upon the trap: 1

In my jigger no sudden feed of slate would occur, because the door is opened gradually, but quickened flow of slate will not result in closing the door, because of the stabilizer, but will only start a slow upward movement of the box or bottom which will be corrected soon by the natural and uniform movement of the slate from the rear to the front.

Where the front and rear of the box or bottom are moved at different rates of speed as, for example, by using variant leverages for their respective support, as in .Fig. 6, the feed of the slate may be accelerated either in the upper or lower range of movement of the box or bottom, as preferred. Ordinarily it would be desirab e to .accelerate in the lower positions of the box or bottom, so as to provide for more rapid movement of the slate when the bed of slate was deepest.

By .varying the counter-weights for any particular percentage of slate being handled, the box or bottom may be safely maintained at nearly its maximum rate of slate discharge.

The uniformity of slate feed secured by y me greatly increases the capacity of a jig:

ger of any given size, since the feed of the ig er'must be restricted at present to avoid un ue accumulation of slate and with my invention the feed can be adjusted to maintain a height of slate equal nearly to the allowable maximum, as at ated, thus providing a greatly 111C]. eased slate be made in the guiding, supportin resent operoutput and a corresponding increase in the amount of coal which can be handled.

It will be evident that the screen bottom affords the ultimate support for the coal and slate and that the bottom, as well as sections of it, may be considered to be movable when this movement actually takes place, even though it be because of the movement of the entire box and not separate therefrom and I have therefore considered .the movable bottom asincluding both my crete unitary result which has not previously been attained. I

It is further evident that differences may counterweighting and stabilizing structures used, as well as in the forced movement of the box, without departing from the spirit and scope of my invention, as protected in the. claims hereof and without interfering in the effective combination of the structures performing these functions, or any of them to secure. additional results by reason of their combination.

. I-laving thus described my invention, what I claim as new and desire to secure by Let ters Patent is 1. In a device of. the character stated, a Water tank, a jigger box adapted to extend within the water, having slate and coal outlets and including an upwardly and downwardly movable screen bottom varying the extent of slate outlet, reciprocable means for' producing relative movement between the water and the screen bottom, a stabilizer for the movable bottom and counter-balancing support for the movable bottom.

9.. In a device of the character stated, a water tank, a jigger box having a slate outlet and prow'ding an upwardly and'do wn wardly movable screen bottom supportfor mixed slate and coal, affecting the extent of slate outlet, reciprocable means for producing relative movement between the water and the screen bottom, dash pot means directly connected with the bottom to resist the upward thrust of the water due to the plunger action and counterpoise means for supporting the weight of the slate and coal.

3. In a device of the character stated, a water tank. a jiggerboxhaving a slate outlet adapted to receive slate and coal to be separated and providing a vertically movable support for the same which afieets the size of the outlet,"reciprocable means for producing relative movement between the water and the support, dash-pot retarding mechanism directly connected to the mov- ,a vertically movable screen bottom supportmg mixed slate and coal, means forcountel-balancing the weight of the slate and coal, a dash pot and connections to damp vertical movement of the screen bottom, liquid inthe dash pot and a connection extending above the dash pot to receive liquid and bring pressure upon the liquid in the dash pot.

5. In a device of the character stated, a

water :tank, a plunger reciprocable therein, an upwardly and downwardly movable bottomsupport for mixed slate and coal and counter-weighted lever means for supportingthe slate and-coal and having thep'roportion of length of lever to the support and counter-weight respectively upon oppo site sides of the fulcrum point automatically varied with changing heights of support.

6. In a device; of the character stated, a

water tank, aplunger reciprocable therein,

anupwardly anddownwardly movable bottom support for mixed slate and coal, counten-weighted lever means for-supporting the slateand coal, having a variable p'ropor tionateleverage upon opposite sides of the =1ever-pivotpo1nt and a stabilizer for damp ing the up and down movement.

7. In a device of the character stated, a tank adapted to hold water, a reciprocable plunger therefor, a jigger box vertically movable: in its entirety adapted to feed from the-bottom of the ':'box .at its lower positions and ,o01npensating eounterweighted levers :anzdrconnections having' variant lengths of lever -holdingathe-gbox, at variant heights aceondinQg. to'thepombined weight of coal and 8. .Inea deviceof the characterystated, a

I jiggervtankjadaptedto hold water, a plungen-reciprocabletherein, a coaland slatereceiving boxverticallymovable within the water- 'andhavingz. an outlet'for coalat' the top andffer s'latel t the bottom in its lowa ingthenmovement ofthe box.

ered-apositionandidash pot means for damp 9.In"adevice-of= he" character stated, a casingtadapted, to receive water, .a plunger reciprocable' therein, a box, adapted to receive coal and slate and having a slate outlet-at the bottom, guides providing for upward and dowiiward movement of the box and attendant-operated means for maintaining the box in raised position while forming a bottom of slate for the content of the box.

10. In a device of the character stated, a tank adapted to receive water, a plunger reciprocable therein, a vertically movable box adapted to receive coal and slate and having a slate outlet, guides for the box-and counter-weighted levers for supporting the box, the length of lever from the box support to the fulcrum having a different proportion to that from the fulcrum to the counter-' weight at different heights of the box to vary the output through the outlet. i

11. In a device of the character stated, a tank adapted to hold water, a plunger recip v rocable therein, a vertically mpvable box adapted to receive coal and slate,-hav-ing;a

having a slate discharge opening adapted to I: i

receive coal and slate, guiding means .-for providing the vertical movement, counter;- wei-ghted supports for the box and dashpot means for stabilizing of the box.

13. In a device of the character stated, a tank adapted to hold water, a plunger reciprocable therein, a. vertically movable box 1 having an opening along one lower edge, counter-weighted means having a variable fulcrum for balancing the box at difi'erent heights in proportion to its weight, a door for the outlet opening and automatic means eng'aging'the door'to closeit to variant extents, in proportion to the height at which the box is balanced.

14. In a device of the character stated, a tank adapted to receive Water, a plunger reeiprocable therein, a box. adaptedito, receive coal and slate, cotiperatingguide members direct-ingthe movement of the box, levers connected with the-box having variant relations of the fulcrum to the pointof box su 1 port and counterweight-andadash pot stabilizer. connected with the box to reduce movement thereof responsive to the water pulsations caused by the plunger.

15. In a device of the character stated, a water tank, a-jiggen box therein, having a slate outlet, .a reciprocable plunger for giving impulse to the-water, a box bottom movable up and down by reason of variant weight of overlying box content. and tending 1 sive to the plunger action, variant fulcrum,

lever counter-Weighting for the movable 1 bottom supporting differing weights at different heights, a door for the slate outlet and connections between the door and the movable parts for opening the door as the bottom lowers.

1C. In a'device of the-character stated, a water tank, a reciprocable water impact plunger therein, a jigger box adapted to extend into the water, having a slate outlet, un upwardly and downwardly movable bottom in proximity to the outlet, counterweighting means for sup 'iorting the movable bottom, a dash pot and direct connections between the dash pot piston'and movable bottom, retarding movement of the bottom in both directions.

17. In a device of the character stated, a water tank, a rcci -rocable plunger therefor,

, a jigger box extending into t e water and having a slate outletra movable box bottom in proximity to the slate outlet, a dash pot having a piston therein, rigid connections between the dashpot piston'and the movable bottom supporting the bottom against tilting, guiding means supporting the bottom laterally and countmr-weighting for the movable bottom.

15.. In a device of the eharacterastated, a water tank, a reciproeable plunger-therefor, a jigger box extending into the water and having aslate outlet, a movable box bottom in proximity to the slate outlet adapted to tend to open and close it, a dash pot having a piston therein, rigid connections between the dash pot piston and the movable bottom,

counter-weighting for the movable bottom and a door for the outlet operated by reason of the movement of the bottom( 19. In a device of the character stated, a water tank, a reeiprocable plunger therefor, a jiggcr box extending into the water and having a slate outlet, a movable box bottom in proximity to the slate outlet adapted to move transversely of the opening, leaving it partially open in, its uppermost position, 

